1. Form a U-shape with a piece of external yarn (working cord) and lay it against your bundle of yarns.
2. Taking the left end of the working cord, wrap it over it’s right end and the front of the bundle, and then under the back of the bundle.
3. Wrap the working cord firmly around the bundle of yarn continuously until you have reached your desired length, ensuring that each wrap is directly underneath the previous one.
4. Pass the end of the working cord through it’s remaining loop. Pull up the right end of the (U-shaped) working cord to slide the loop inside the wrapped area until it is half way through. Cut off the ends close to the knot.